People in isolated rain-forest communities tend to live on a largely vegetarian diet, and
they eat little salt. Few of them suffer from high blood pressure, and their blood pressure
does not tend to increase with age, as is common in industrialized countries. Such people often do develop high blood pressure when they move to cities and adopt high-salt diets.
Though suggestive, these facts do not establish salt as the culprit in high blood pressure,
however, because ________.
A. genetic factors could account for the lack of increase of blood pressure with age
among such people
B. people eating high-salt diets and living from birth in cities in industrialized
societies generally have a tendency to have high blood pressure
C. it is possible to have a low-salt diet while living in a city in an industrialized
country
D. there are changes in other aspects of diet when such people move to the city
E. salt is a necessity for human life, and death can occur when the body loses too
much salt
谢谢，答案知道为什么，就是不知道化黄线的部分 到底是和热带雨林人们的现象一样呢，还是相反呢？
觉得应该相反才对，但是又没有否定词？奇怪！谢谢了